CN111745103A - Forging forming method for medical titanium alloy femoral stem forging - Google Patents
Forging forming method for medical titanium alloy femoral stem forging Download PDFInfo
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- CN111745103A CN111745103A CN202010607856.0A CN202010607856A CN111745103A CN 111745103 A CN111745103 A CN 111745103A CN 202010607856 A CN202010607856 A CN 202010607856A CN 111745103 A CN111745103 A CN 111745103A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/002—Hybrid process, e.g. forging following casting
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/32—Joints for the hip
- A61F2/36—Femoral heads ; Femoral endoprostheses
- A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
- B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J13/00—Details of machines for forging, pressing, or hammering
- B21J13/02—Dies or mountings therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J3/00—Lubricating during forging or pressing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
- B21J5/027—Trimming
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K29/00—Arrangements for heating or cooling during processing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
Abstract
The invention provides a forging forming method of a medical titanium alloy femoral stem forging, which can effectively utilize raw materials, control the size of the produced titanium alloy femoral stem forging within a reasonable range, and simultaneously has good surface quality. Which comprises the following stepsThe following steps: step one, blanking; modeling and measuring volume V using three-dimensional software1Volume of material fed V2=V1Determining the blanking diameter according to the maximum cross-sectional area of the product, and determining the blanking length according to the blanking volume and the blanking diameter to cut out a corresponding bar; step two, upsetting and bending; step three, pre-forging; step four, trimming the surface and the size of the workpiece according to the surface condition and the size condition; step five, finish forging; sixthly, trimming the finish forging and then annealing; seventhly, carrying out chemical milling treatment on the workpiece; and step eight, milling the flash and polishing and repairing the contour of the forge piece for the workpiece.
Description
Technical Field
The invention relates to the technical field of forging methods, in particular to a forging and forming method of a medical titanium alloy femoral stem forging.
Background
Titanium is a novel metal, the performance of titanium is related to the content of impurities such as carbon, nitrogen, hydrogen, oxygen, and the like, and the performance of 99.5 percent of industrial pure titanium is as follows: density ρ =4.5g/cm3, tensile strength σ b =539MPa, elongation = 25%, reduction of area Ψ = 25%, elastic modulus E =1.078 × 105MPa, hardness HB 195. Can be applied to the industries of aviation (jet engine, engine), medical health (medical instruments and orthopedic materials, titanium teeth, bone joints, fixing screws, titanium bones and the like), industry (fuselage), rocket, missile and spacecraft industry, ship and naval vessel manufacturing industry, chemical industry, petroleum industry and the like. The Ti6Al4V titanium alloy is a dual-phase alloy, has good comprehensive performance, good structural stability, excellent toughness, plasticity and high-temperature deformation performance, can be better subjected to hot pressure processing, and can be quenched and aged to strengthen the alloy. The temperature after the heat treatment is improved by 50-100% compared with the annealing state; the high-temperature strength is high, the high-temperature alloy can work for a long time at the temperature of 400-500 ℃, and the thermal stability is second to that of the alpha titanium alloy.
Pure titanium and Ti6Al4V titanium alloy are the earliest titanium alloy applied to the medical instrument industry, and have been widely applied in the field of surgical implants, and clinical experience is relatively mature, while pure titanium has the defects of low strength, poor wear resistance and the like, so that the Ti6Al4V titanium alloy can be used as a product for replacing pure titanium to be applied to high-strength surgical implants, and has excellent biocompatibility and comprehensive performance, thereby obtaining high acceptance in the medical enterprise industry. The Ti6Al4V titanium alloy comprises the following components in percentage by weight: al: 5.5 to 6.8; v: 3.5 to 4.5; fe: 0.3; o: 0.2; si: 0.15; c: 0.1; n: 0.05; h: 0.01; and others: 0.5; the balance being Ti.
The manufacturing method of the titanium alloy medical orthopedic implant mainly comprises two modes of casting and forging. Patent CN102764839A (a titanium alloy forging process) describes a titanium alloy workpiece forging process; CN106064225A (forging process of TC4 alloy) effectively improves the forging speed of die forging and the size precision of titanium alloy by carrying out solid nitrogen treatment on the TC4 alloy and improving the forging parameters; CN107552697B (TC 4 titanium alloy bar forging method) improves the precision forging process to obtain a titanium alloy blank; CN109536777B (a high-temperature titanium alloy and a preparation method thereof) researches a preparation method of the high-temperature titanium alloy prepared by forging and heat treatment of a blank, analyzes the content ratio of each metal component in the blank, and obtains a forged workpiece by two-fire treatment; CN104972031A (a titanium alloy forging process) designs a simple forging process path, a protective agent is coated on the surface of a workpiece, the workpiece is heated to 1000 ℃ and is kept warm for 0.5h, and then is heated to 1200 ℃ and is kept warm for 2h, and then is forged and formed, so that the production efficiency is greatly improved, and the surface quality of a forged piece is also improved; CN104959571A (forging method of titanium alloy) introduces a forging method of titanium alloy, which improves the strength of the titanium alloy by strictly controlling the processing temperature and adopting a three-time heating and heat preservation mode. However, when titanium alloy femoral stem forgings are actually produced, the problems of low utilization rate of raw materials, unqualified surface quality and size after forging and forming and the like often exist.
Disclosure of Invention
The invention provides a forging and forming method of a medical titanium alloy femoral stem forging, aiming at the problems of low utilization rate of raw materials and unqualified surface quality and size after forging and forming in the titanium alloy forging process, which can effectively utilize raw materials, controls the size of the produced titanium alloy femoral stem forging within a reasonable range, and has good surface quality.
The technical scheme is as follows: a forging forming method for a medical titanium alloy femoral stem forging is characterized by comprising the following steps: step one, blanking; utilizing three-dimensional software to establish a product model and measuring the volume thereof through the software to obtain a volume V1Volume of material fed V2=V1Determining a blanking diameter according to the maximum cross-sectional area of the product, determining a blanking length according to the blanking volume and the blanking diameter, selecting a bar with a corresponding diameter according to the blanking diameter, and cutting out the bar with a corresponding length according to the blanking length;
step two, upsetting and bending; heating the bar stock to 930-950 ℃, keeping the temperature for 12-20 min, taking out, extruding, bending and forming the bar stock, polishing and repairing the surface defects of the workpiece, spraying glass coating on the surface of the workpiece, and heating to enable the glass coating to be adhered to the surface of the workpiece;
step three, pre-forging; heating the bent piece to 930-950 ℃, preserving heat for 16-24 min, taking out, heating the die before forging, spraying a graphite lubricant on the surface of the die, placing the heated bent piece on the die for forging and forming, checking the surface of the pre-forged piece after forging, and measuring the size;
step four, trimming the surface and the size of the workpiece according to the surface condition and the size condition;
step five, finish forging; heating the bent piece to 890-910 ℃, keeping the temperature for 12-21 min, taking out, heating the die before forging, spraying a graphite lubricant on the surface of the die, placing the workpiece on the die for forging and forming, and checking the surface condition and the size deviation condition of the finish forging piece after forging;
sixthly, trimming the finish forging piece, wherein the residual flash width is +2mm to +4mm, and then annealing;
seventhly, carrying out chemical milling treatment on the workpiece; firstly, grouping batch products according to thickness deviation, determining chemical milling amount of each group according to the thickness, then performing chemical milling on the batch products, measuring the size of a workpiece after chemical milling, performing secondary grouping according to a measurement result, determining the chemical milling amount of each group according to the thickness, and performing secondary chemical milling on the chemical milling amount;
and step eight, milling the flash and polishing and repairing the contour of the forge piece for the workpiece.
It is further characterized in that:
step three and step five, heating the die to 180-220 ℃;
in the sixth step, the annealing temperature is 740-760 ℃, and the temperature is kept for 60-72 min;
removing the single surface by 0.03-0.07 mm in the chemical milling treatment in the seventh step; grouping the first time by the thickness difference of 0.03 mm; the second grouping was done with a thickness difference of 0.02 mm.
The invention has the beneficial effects that: the titanium alloy femoral stem forging produced by the method has the material utilization rate of 67 percent, good surface quality of workpieces and no defects such as folding, pits, pockmarks, cracks and the like; meanwhile, the forging process involves upsetting bending, heating pre-forging and heating finish forging, so that the deformation process of the workpiece becomes stable, and then the workpiece is subjected to heat treatment, so that the grain size inside the workpiece meets the use requirement; the workpiece dimensions can be tightly controlled by performing the chemical milling twice in thickness groups to be within a reasonable tolerance zone dimension range.
Drawings
FIG. 1 is a raw bar stock for a process to be bent;
FIG. 2 is a schematic view of a bent and deformed shape;
FIG. 3 is a schematic view of the shape after the hot preforging;
FIG. 4 is a schematic view of the shape after the finish forging by heating.
Detailed Description
A forging forming method for a medical titanium alloy femoral stem forging comprises the following steps of firstly, blanking; according to the original three-dimensional model of the forging, the volume of the forging is measured by using three-dimensional software UG, and the blanking volume is 1000mm larger than the original model2-1300mm2The blanking weight required by forge piece production is calculated according to density, the maximum cross-sectional area is converted into an equivalent circle diameter, the blanking diameter is determined, cylindrical bars with the diameter of 18mm can be selected according to the measured volume and the maximum cross-sectional area of the product, a circular saw or a band sawing machine is used for cutting blanking, the blanking length is 235-237 mm, and the weight of the bars is measured, so that the calculated blanking weight is 1060-1070 g.
Step two, upsetting and bending; putting the bar stock into an electric converter to be heated to 930-950 ℃, keeping the temperature for 12-20 min, taking out the bar stock, putting the bar stock on a horizontal forging machine to obtain a workpiece by extrusion, as shown in figure 1, bending and forming the workpiece to obtain the workpiece as shown in figure 2, polishing and repairing defects such as folding, cracks, pits and the like on the surface of the workpiece, spraying glass paint on the surface of the workpiece, and heating to enable the glass paint to be adhered to the surface of the workpiece.
Step three, pre-forging; heating the bent piece to 930-950 ℃ in an electric converter, keeping the temperature for 16-24 min, taking out, heating a pre-forging die to 180-220 ℃ in advance, spraying a graphite lubricant on the surface of the die, placing the bent piece on the die of an electric screw press for forging and forming to obtain a workpiece as shown in figure 3, inspecting the surface of the pre-forging piece after forging, polishing and repairing the pre-forging piece if the surface is not required, allowing defects such as folding, cracks and pulling damage to occur, allowing the shoulder to be slightly unfilled, measuring the critical section size, and ensuring that the critical section size is within the tolerance range.
And step four, performing procedures such as edge cutting, pre-chemical milling, defect polishing and the like on the pre-forged piece to enable the surface and the size of the pre-forged piece to meet the technological requirements.
Step five, finish forging; heating the bent piece to 890-910 ℃ in an electric converter, keeping the temperature for 12-21 min, taking out, heating a finish forging die to 180-220 ℃ in advance, spraying a graphite lubricant on the surface of the die, placing a pre-forged piece on the die of an electric screw press for forging and forming, wherein the obtained workpiece is as shown in figure 4, checking the surface condition and the size deviation condition of the finish forging piece after forging, polishing and repairing the finish forging piece if the finish forging piece is not required, allowing the surface to have defects such as folding, cracks, strain and the like, measuring the critical section size, and ensuring that the critical section size is within the tolerance band range.
And sixthly, trimming the finish forging piece, wherein the residual flash width is +2mm to +4mm, then annealing, controlling the annealing temperature within the range of 740 ℃ to 760 ℃, and keeping the temperature for 60min to 72 min.
And seventhly, performing chemical milling treatment on the workpiece, wherein the single-side removal amount is 0.03-0.07 mm, grouping batch products, wherein chemical milling needs to be performed for multiple times, and the chemical milling in a chemical milling groove is repeated for multiple times, so that the chemical reaction temperature rise of groove liquid is generated, the chemical milling amount is inaccurate, and meanwhile, considering the production efficiency, grouping is performed by the thickness difference of 0.03mm, and the chemical milling amount needs to be marked on a flow box. And measuring the size of the workpiece, performing secondary grouping on the workpiece with the out-of-tolerance according to the measurement result, grouping according to the thickness difference of 0.02mm, marking the chemical milling amount on the flow box, performing secondary chemical milling according to the grouping result, and determining the amount of removal according to the grouping thickness.
And step eight, performing the processes of milling the flash and polishing the contour of the forged piece, clamping the workpiece on a milling flash clamp, removing the residual flash after trimming, and polishing and repairing the defects of folding, pits, cracks and the like on the surface of the workpiece by using a fine abrasive belt to ensure smooth transfer and no obvious polishing mark.
The method of the invention is specifically described below by taking a Ti6Al4V titanium alloy femoral stem forging as an example, and the example is carried out in three batches. The method comprises the following steps:
batch 1:
(1) according to the original three-dimensional model of the forging, the volume of the forging is measured by using three-dimensional software UG, and the blanking volume is 1200mm larger than the original model2On the left and right sides, calculating the blanking weight required by the production of the forged piece according to the density, converting the maximum cross-sectional area into the equivalent circle diameter, determining the blanking diameter, selecting a phi 18mm round bar according to the measured volume and the maximum cross-sectional area of the product, cutting and blanking by using a circular saw or a band sawing machine, wherein the blanking length is 235mm, and the measured bar weight is 1060 g;
(2) putting the bar stock into an electric converter to be heated to 940 ℃, keeping the temperature for 12min, taking out the bar stock, putting the bar stock on a horizontal forging machine to be extruded and bent for forming, polishing and repairing defects of folding, cracks, pits and the like on the surface of a workpiece, spraying glass paint on the surface of the workpiece, and heating to enable the glass paint to be adhered to the surface of the workpiece;
(3) heating the bent piece to 950 ℃ in an electric converter, keeping the temperature for 24min, taking out the bent piece, heating a preforging die to 200 ℃ in advance, spraying a graphite lubricant on the surface of the die, placing the bent piece on a die of an electric screw press for forging and forming, inspecting the surface of the preforging piece after forging is finished, allowing no defects such as folding, cracks, pulling damage and the like, allowing the shoulder part to be slightly unfilled, measuring the critical section size, and ensuring that the critical section size is within a tolerance band range;
(4) the pre-forging piece is subjected to procedures of trimming, pre-milling, polishing and repairing defects and the like, so that the surface and the size of the pre-forging piece meet the process requirements;
(5) heating the bent piece to 890 ℃ in an electric converter, keeping the temperature for 21min, then taking out, heating a finish forging die to 220 ℃ in advance, spraying a graphite lubricant on the surface of the die, placing a pre-forged piece on the die of an electric screw press for forging and forming, checking the surface condition and the size deviation condition of the finish forging piece after forging is finished, allowing the surface not to have defects such as folding, cracks, strain and the like, measuring the critical section size, and ensuring that the critical section size is within the tolerance band range;
(6) trimming the finish forging, wherein the residual flash width is plus 2mm to plus 4mm, then annealing, controlling the annealing temperature within 740 ℃, and keeping the temperature for 66 min;
(7) the chemical milling treatment is carried out on the workpiece, the single-side milling amount is 0.07mm, batch products are grouped, the chemical milling is carried out for multiple times, chemical milling is carried out in a chemical milling groove for multiple times, chemical reaction heating is generated in groove liquid, the chemical milling amount is inaccurate, meanwhile, the chemical milling amount is grouped by the thickness difference of 0.03mm in consideration of production efficiency, and the chemical milling amount needs to be marked on a flow box. Measuring the size of the workpieces, grouping the out-of-tolerance workpieces for the second time according to the measurement result, grouping the out-of-tolerance workpieces by the thickness difference of 0.02mm, and marking the chemical milling amount on a flow box; carrying out secondary chemical milling according to the grouping result, wherein the removal amount is determined by the grouping thickness;
(8) the method comprises the following steps of carrying out milling flash and polishing and repairing forge piece contour process treatment on a workpiece, clamping the workpiece on a milling flash clamp, removing residual flash after trimming, and polishing and repairing defects of surface folding, pits, cracks and the like of the workpiece by using a fine abrasive belt to ensure smooth transfer and no obvious polishing marks.
Batch 2:
(1) according to the original three-dimensional model of the forging, the volume of the forging is measured by using three-dimensional software UG, and the blanking volume is 1200mm larger than the original model2On the left and right sides, calculating the blanking weight required by the production of the forged piece according to the density, converting the maximum cross-sectional area into the equivalent circle diameter, determining the blanking diameter, selecting a phi 18mm round bar according to the measured volume and the maximum cross-sectional area of the product, cutting the blanking by using a circular saw or a band sawing machine, wherein the blanking length is 237mm, and the measured bar weight is 1070 g;
(2) putting the bar stock into an electric converter to be heated to 930 ℃, keeping the temperature for 16min, taking out the bar stock, putting the bar stock on a horizontal forging machine to be extruded and bent for forming, polishing and repairing defects of folding, cracks, pits and the like on the surface of a workpiece, spraying glass paint on the surface of the workpiece, and heating to enable the glass paint to be adhered to the surface of the workpiece;
(3) heating the bent piece to 940 ℃ in an electric converter, keeping the temperature for 16min, taking out, heating a preforging die to 220 ℃ in advance, spraying a graphite lubricant on the surface of the die, placing the bent piece on a die of an electric screw press for forging and forming, inspecting the surface of the preforging piece after forging is finished, not allowing the defects of folding, cracking, pulling and the like to occur, allowing the shoulder part to be slightly unfilled, measuring the critical section size, and ensuring that the critical section size is within a tolerance band range;
(4) the pre-forging piece is subjected to procedures of trimming, pre-milling, polishing and repairing defects and the like, so that the surface and the size of the pre-forging piece meet the process requirements;
(5) heating the bent piece to 900 ℃ in an electric converter, keeping the temperature for 12min, taking out, heating a finish forging die to 200 ℃ in advance, spraying a graphite lubricant on the surface of the die, placing a pre-forged piece on the die of an electric screw press for forging and forming, checking the surface condition and the size deviation condition of the finish forging piece after forging is finished, allowing the surface not to have defects such as folding, cracks, strain and the like, measuring the critical section size, and ensuring that the critical section size is within the tolerance band range;
(6) trimming the finish forging, wherein the residual flash width is +2mm to +4mm, then annealing, controlling the annealing temperature within 750 ℃, and keeping the temperature for 60 min;
(7) the chemical milling treatment is carried out on the workpiece, the single-side milling amount is 0.03mm, batch products are grouped, the chemical milling is carried out for multiple times, chemical milling is carried out in a chemical milling groove for multiple times, chemical reaction heating is generated in groove liquid, the chemical milling amount is inaccurate, meanwhile, the chemical milling amount is grouped by the thickness difference of 0.03mm in consideration of production efficiency, and the chemical milling amount needs to be marked on a flow box. Measuring the size of the workpieces, grouping the out-of-tolerance workpieces for the second time according to the measurement result, grouping the out-of-tolerance workpieces by the thickness difference of 0.02mm, and marking the chemical milling amount on a flow box; carrying out secondary chemical milling according to the grouping result, wherein the removal amount is determined by the grouping thickness;
(8) the method comprises the following steps of carrying out milling flash and polishing and repairing forge piece contour process treatment on a workpiece, clamping the workpiece on a milling flash clamp, removing residual flash after trimming, and polishing and repairing defects of surface folding, pits, cracks and the like of the workpiece by using a fine abrasive belt to ensure smooth transfer and no obvious polishing marks.
Batch 3:
(1) according to the original three-dimensional model of the forging, the volume of the forging is measured by using three-dimensional software UG, and the blanking volume is 1200mm larger than the original model2On the left and right sides, calculating the blanking weight required by the production of the forged piece according to the density, converting the maximum cross-sectional area into the equivalent circle diameter, determining the blanking diameter, selecting a phi 18mm round bar according to the measured volume and the maximum cross-sectional area of the product, cutting the blanking by using a circular saw or a band sawing machine, wherein the blanking length is 236mm, and measuring the weight position of the bar 1065 g;
(2) putting the bar stock into an electric converter to be heated to 950 ℃, keeping the temperature for 20min, taking out the bar stock, putting the bar stock on a horizontal forging machine to be extruded and bent for forming, polishing and repairing defects of folding, cracks, pits and the like on the surface of a workpiece, spraying glass paint on the surface of the workpiece, and heating to enable the glass paint to be adhered to the surface of the workpiece;
(3) heating the bent piece to 930 ℃ in an electric converter, keeping the temperature for 12min, taking out, heating a preforging die to 180 ℃ in advance, spraying a graphite lubricant on the surface of the die, placing the bent piece on a die of an electric screw press for forging and forming, inspecting the surface of the preforging piece after forging is finished, not allowing the defects of folding, cracking, pulling and the like to occur, allowing the shoulder part to be slightly unfilled, measuring the critical section size, and ensuring that the critical section size is within a tolerance band range;
(4) the pre-forging piece is subjected to procedures of trimming, pre-milling, polishing and repairing defects and the like, so that the surface and the size of the pre-forging piece meet the process requirements;
(5) heating the bent piece to 910 ℃ in an electric converter, keeping the temperature for 17min, taking out, heating a finish forging die to 180 ℃ in advance, spraying a graphite lubricant on the surface of the die, placing a pre-forged piece on the die of an electric screw press for forging and forming, checking the surface condition and the size deviation condition of the finish forging piece after forging is finished, allowing the surface to have no defects such as folding, cracking, pulling and the like, measuring the critical section size, and ensuring that the critical section size is within the tolerance band range;
(6) trimming the finish forging, wherein the residual flash width is plus 2mm to plus 4mm, then annealing, controlling the annealing temperature within 760 ℃, and keeping the temperature for 72 min;
(7) the chemical milling treatment is carried out on the workpiece, the single-side milling amount is 0.05mm, batch products are grouped, the chemical milling is carried out for multiple times, chemical milling is carried out in a chemical milling groove for multiple times, chemical reaction heating is generated in groove liquid, the chemical milling amount is inaccurate, meanwhile, the chemical milling amount is grouped by the thickness difference of 0.03mm in consideration of the production efficiency, and the chemical milling amount needs to be marked on a flow box. Measuring the size of the workpieces, grouping the out-of-tolerance workpieces for the second time according to the measurement result, grouping the out-of-tolerance workpieces by the thickness difference of 0.02mm, and marking the chemical milling amount on a flow box; carrying out secondary chemical milling according to the grouping result, wherein the removal amount is determined by the grouping thickness;
(8) the method comprises the following steps of carrying out milling flash and polishing and repairing forge piece contour process treatment on a workpiece, clamping the workpiece on a milling flash clamp, removing residual flash after trimming, and polishing and repairing defects of surface folding, pits, cracks and the like of the workpiece by using a fine abrasive belt to ensure smooth transfer and no obvious polishing marks.
By testing, the medical titanium alloy femoral stem component produced by the forging and forming method of the forging component has the material utilization rate of 67 percent, and is obviously improved compared with the prior art; through forging processes such as upsetting bending, heating pre-forging, heating finish forging and the like, the plastic deformation process of the workpiece is more stable; the critical section dimensions of the workpiece are measured and are all within the tolerance zone range, the shoulder part and the handle body have no dislocation phenomenon, the surface of the product has no defects of folding, pits, pockmarks, cracks and the like, and the product percent of pass reaches 95%.
The product is subjected to physicochemical test to obtain a physicochemical result of batch 1: the low power flow lines are distributed along the shape, and have no flow through and vortex, the high power tissue inspection conforms to the GB/T13810-2017 standard, no layer a exists, and the hydrogen content is less than or equal to 0.0042 percent and less than or equal to 0.008 percent; batch 2 physicochemical results: the low power flow lines are distributed along the shape, have no flow through and eddy, the high power tissue inspection conforms to the GB/T13810-2017 standard, no layer a exists, and the hydrogen content is less than or equal to 0.008 percent and less than or equal to 0.0038 percent; batch 3 physicochemical results: the low power flow lines are distributed along the shape, and have no flow through and vortex, the high power tissue inspection conforms to the GB/T13810-2017 standard, no layer a exists, the hydrogen content is less than or equal to 0.008 percent and conforms to the standard requirement.
According to the actual measurement result of the product, the invention can effectively improve the material utilization rate, meet the specified standard of the medical forging and meet the mass production requirement of enterprises.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (4)
1. A forging forming method for a medical titanium alloy femoral stem forging is characterized by comprising the following steps: step one, blanking; utilizing three-dimensional software to establish a product model and measuring the volume thereof through the software to obtain a volume V1Volume of material fed V2=V1Determining a blanking diameter according to the maximum cross-sectional area of the product, determining a blanking length according to the blanking volume and the blanking diameter, selecting a bar with a corresponding diameter according to the blanking diameter, and cutting out the bar with a corresponding length according to the blanking length;
step two, upsetting and bending; heating the bar stock to 930-950 ℃, keeping the temperature for 12-20 min, taking out, extruding, bending and forming the bar stock, polishing and repairing the surface defects of the workpiece, spraying glass coating on the surface of the workpiece, and heating to enable the glass coating to be adhered to the surface of the workpiece;
step three, pre-forging; heating the bent piece to 930-950 ℃, preserving heat for 16-24 min, taking out, heating the die before forging, spraying a graphite lubricant on the surface of the die, placing the heated bent piece on the die for forging and forming, checking the surface of the pre-forged piece after forging, and measuring the size;
step four, trimming the surface and the size of the workpiece according to the surface condition and the size condition;
step five, finish forging; heating the bent piece to 890-910 ℃, keeping the temperature for 12-21 min, taking out, heating the die before forging, spraying a graphite lubricant on the surface of the die, placing the workpiece on the die for forging and forming, and checking the surface condition and the size deviation condition of the finish forging piece after forging;
sixthly, trimming the finish forging piece, wherein the residual flash width is +2mm to +4mm, and then annealing;
seventhly, carrying out chemical milling treatment on the workpiece; firstly, grouping batch products according to thickness deviation, determining chemical milling amount of each group according to the thickness, then performing chemical milling on the batch products, measuring the size of a workpiece after chemical milling, performing secondary grouping according to a measurement result, determining the chemical milling amount of each group according to the thickness, and performing secondary chemical milling on the chemical milling amount;
and step eight, milling the flash and polishing and repairing the contour of the forge piece for the workpiece.
2. The forging and forming method of the medical titanium alloy femoral stem forging piece according to claim 1, characterized in that: and step three and step five, heating the die to 180-220 ℃.
3. The forging and forming method of the medical titanium alloy femoral stem forging piece according to claim 1, characterized in that: in the sixth step, the annealing temperature is 740-760 ℃, and the temperature is kept for 60-72 min.
4. The forging and forming method of the medical titanium alloy femoral stem forging piece according to claim 1, characterized in that: removing the single surface by 0.03-0.07 mm in the chemical milling treatment in the seventh step; grouping the first time by the thickness difference of 0.03 mm; the second grouping was done with a thickness difference of 0.02 mm.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112338118A (en) * | 2020-10-14 | 2021-02-09 | 无锡航亚科技股份有限公司 | Precision forging forming method of titanium alloy femoral stem |
| CN112387913A (en) * | 2020-10-23 | 2021-02-23 | 无锡航亚科技股份有限公司 | Upsetting die for forging blank of hip joint handle forging and blank manufacturing method thereof |
| CN112496247A (en) * | 2020-11-16 | 2021-03-16 | 无锡航亚科技股份有限公司 | Hot forging forming method for titanium alloy aviation three-way elbow joint |
| CN113319528A (en) * | 2021-05-27 | 2021-08-31 | 无锡航亚科技股份有限公司 | Medical bone fracture plate forging optimization process |
| CN114472773A (en) * | 2021-12-30 | 2022-05-13 | 遵义航天新力精密铸锻有限公司 | Integral forming process for mounting support points of aero-engine |
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